While doing some research on the 1973 Haiti 50 Gourde "Mermaid" coin (KM# 104),
https://en.numista.com/19328I ran across two examples of 1973 (supposedly official) mint sets which would have been struck at the
Royal Canadian Mint.
The coins in the first set look exactly like the normal (not in sets) proofs, note especially the .925 hallmark below and left of the Hatian arms:

Copyright Stack's Bowers
https://www.acsearch.info/search.html?id=12103468The coins in this second set are all lacking the hallmarks:

Copyright VLNummus
https://www.acsearch.info/search.html?id=8739553I only ran across this because I saw one of these 50 Gourdes coins without a hallmark for sale on
ebay (no, I wasn;t shopping, just doing research). I messaged the seller to say I did not think the coin was authentic, and the response was to say that the coins in sets did not have the hallmark, and they provided a link to the Nummus auction listing shown above. Didn't make sense to me, but the auction photo at least was consistent.
Thoughts?